<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="http://www.baidu.com" method="post">
        <input type="text" name="username" size="30"  value="xx" id="">
        <input type="text" name="username2" size="30" readonly value="yyy" id="">
        <input type="password" name="password"  value="xxx" id="">

        男<input type="radio" name="sex" id="" value="0">
        女<input type="radio" name="sex" id="1" checked>

        <input type="checkbox" name="hobb" id="" value="1">
        <input type="checkbox" name="hobb" id="" value="2">
        <input type="checkbox" name="hobb" id="" value="3">

        <select name="nation" id="">
            <option value="v1">11111111111</option>
            <option value="v2">222222</option>
            <option value="v3">333333</option>

        </select>
        <textarea name="des" id="" cols="3" rows="10"></textarea>
        <input type="file" name="myfile" id="">

        <input type="email" name="myem" id="">
        <input type="url" name="myurl" id="">

        <input type="number" name="mynum" id="" min="1" max="100" step="5">
        <input type="range" name="myrange" id="" min="1" max="100" step="5">

        <input type="date" name="myda" id="" required>

        <input type="text" name="" placeholder="雷神电脑" value="xx" id="" required>
        <input  type="image"  src="./github.png" onclick="alert90" />


        <input type="submit" value="提交">  
        <input type="reset" value="重置">

        <input type="button" value="我是普通按钮" onclick="alert()">
    </form>
</body>
</html>